Sony as a corporation with insane experience, holding one of the biggest movie/series publishers (Sony Pictures) and one of the best VFX makers that assist outside studios as well like Disney (+Marvel), WB and others (Sony Pictures Imageworks). Also they are the biggest in imaging technology (alpha, CineAlta, imaging sensors). Sony Music as well is one of the biggest in their sector. They make some of the best sound systems and technologies, they have the most accurate colored and best upscaling and processing systems in TV's, they have reference monitors that cost beyond $30K.
Above all of that, Sony gives time, generous money and support to the studios to flourish. You can see Sumo studio with Crackdown 3 and Sackboy, same studio but different outcomes. Also They have dedicated studio for mocaps and other necessary tech for all first party games and first party studios to share.
As they say, Rome wasn't built in a day.